Add Vite 6 support

[markdalgleish]

Tasks:

• Support integration tests running against both Vite 5 and 6
• Fix CSS side-effect FOUC in dev
• Fix typecheck command
• Fix client HMR on server code changes
• Run config/routes.ts integration tests against Vite 5 and 6

[changeset-bot]

🦋 Changeset detected

Latest commit: 98e8c25

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 11 packages

Name	Type
@react-router/dev	Major
@react-router/fs-routes	Major
@react-router/remix-routes-option-adapter	Major
create-react-router	Major
react-router	Major
react-router-dom	Major
@react-router/architect	Major
@react-router/cloudflare	Major
@react-router/express	Major
@react-router/node	Major
@react-router/serve	Major

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[sapphi-red]

I made these PR to remix while testing Vite 6. I didn't try them with RR7, but it might be useful.
remix-run/remix#10254, remix-run/remix#10255

[markdalgleish]

This was bumped because v3 is the first major version of vite-node to officially support both Vite v5 and v6: https://github.com/vitest-dev/vitest/blob/main/packages/vite-node/package.json#L89. I think it's okay we're running a beta version because we're using vite-node in a very limited capacity to run config files and we don't expose any Vite internals to consumers. However, just to be sure, we run the routes.ts tests against both v5 and v6 of Vite.

[markdalgleish]

@sapphi-red Thanks for your help on the Remix repo. I've applied your HMR fix here, and I've also adjusted my approach for using ssrLoadModule for CSS files to detect the major version of Vite, just like your Remix PR. I initially wanted to avoid relying on Vite version numbers to toggle behaviour if possible, but I think your approach is more straightforward if you don't consider this to be a problem.

[markdalgleish]

Just noting that I pair reviewed these changes with @pcattori.

[sapphi-red]

Great that it's merged 🙂 It would be nice if we can have RR7 in the ecosystem-ci as well.

[github-actions]

🤖 Hello there,

We just published version 7.1.0-pre.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version 7.1.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!